PANASONIC AN8807SB

ICs for CD/CD-ROM Player
AN8807SB
Three-Beam Method Head Amplifier IC for CD-ROM
■ Overview
19
15.2±0.3
0.3±0.11
18
0.5
8.4±0.3
11.93±0.3
2.85±0.2
1.3±0.25
1.3±0.25
automatic adjustment for tracking balance, tracking
gain, tracking offset, focus balance, focus gain and
focus offset
36
0.2 +– 0.1
0.05
fier, RF amplifier and APC built-in
• Detectors of DO, CROSS, OFTR and vibration built-in
• Combination with the MN662710RA providing complete
1
0.8
■ Features
• Single supply operation
• I–V amplifier, tracking error amplifier, focus error ampli-
Umit : mm
0.1±0.1
The AN8807SB is a head amplifier IC supporting the
digital servo.
Combination of this IC and the MN662710RA (digital
servo processor + signal processing + DAC/DF) allows
the rational CD ROM system to be constructed with small
number of external parts.
36-lead SSOP package (SSOP036-P-0450A)
C
D
E
30
24
+
4
TEOUT
FE–
25
+ –
28
+
+
23
TEBPF
–
10
ARF
AGC
9
+
TE–
26
–
CACC
8
22
1
RF
Det.
17
RFDET
V Det.
+
C.CRS
–
+ –
27
FD
LD ON/OFF
3
OFTR
BDO
–
–
ENV
ENV Det.
+
12
+
11
–
CENV
+
CROSS
Subtracter
FEOUT
CEA
+
TBAL
+
–
–
+
–
VCBA
VCBA
+
–
+
33
32
VCBA
–
–
29
+
PDER
F
31
+
–
VCBA
–
–
RFOUT
+
PDFR
35
36
–
7
+
B+D
A+C
6
+
+
D
B
A
A
RF–
FBAL
19
CSBDO
CSBRT
VCC
2
LD
+
21 LD OFF
20 VREF
18
5
16 OFTR
15
14 BDO
13
AN8807SB
ICs for CD-ROM Player
■ Block Diagram
ICs for CD/CD-ROM Player
AN8807SB
■ Pin Description
Pin No.
Pin Name
I/O
Function Description
1
PD
I
Signal input of PD for LD output monitor
2
LD
O
Connected to base of external Tr for LD drive
3
LDON
I
ON/OFF switching of LD APC
4
C. CRS
5
VCC
6
RF–
I
Reverse rotation input pin of RF Amp. for connecting a resistance
7
RFOUT
O
Output pin of RF Amp. (reverse rotation amp.)
8
RFIN
I
RF AGC input pin
9
C. AGC
10
ARF
11
C. ENV
C-connecting pin for RF
12
C. EA
C-connecting pin for amp.
13
C. SBDO
14
BDO
15
C. SBRT
16
OFTR
O
OFF TRACK detection output pin; positive logic
17
NRFDET
O
Output pin of RF signal amplitude detection; negative logic
18
GND
19
ENV
O
20
VREF
O
VCC × 0.5 (V) output pin
21
LD OFF
I
Input pin for forced stop of LD APC
22
VDET
O
Output pin of vibration detection
23
TEBPF
I
Input pin of vibration detection
24
CROSS
O
Output pin of TE CROSS detection signal
25
TEOUT
O
Output pin of TE Amp.
26
TE–
I
Inverting input pin of TE Amp. for connecting a resistance
27
FEOUT
O
Output pin of FE Amp.
28
FE–
I
Inverting input pin of FE Amp. for connecting a resistance
29
FBAL
I
Control signal input pin for FO balance adjustment
30
TBAL
I
31
PDFR
32
PDER
33
PDE
I
Connected to PIN Diode E
34
PDF
I
Connected to PIN Diode F
35
PDBD
I
Connected to B/D of astigmatic 4-division PD
36
PDAC
I
Connected to A/C of astigmatic 4-division PD
Capacity connecting pin for CROSS
Supply connecting pin
C-connecting pin for RF AGC loop filter
RF output pin after AGC
O
C-connecting pin for low speed detection of dark level DO
BDO detection output pin; positive logic
O
C-connecting pin for OFTR low speed detection
Ground pin
ENV output pin
Control signal input pin for TE balance adjustment
Resistance-connected pin setting the I –V conversion resistance value of PDE
Resistance-connected pin setting the I –V conversion resistance value of PDF
■ Absolute Maximum Ratings (Ta=25˚C)
Symbol
Rating
Supply Voltage
Parameter
VCC
6
Unit
V
Supply Current
ICC
40
mA
Power Dissipation
PD
240
mW
Operating Ambient Temperature
Storage Temperature
Topr
–20 ~ + 75
˚C
Tstg
–55 ~ + 125
˚C
ICs for CD-ROM Player
AN8807SB
■ Recommended Operating Range (Ta=25˚C)
Parameter
Operating Supply Voltage Range
Symbol
Range
VCC
3.4V ~ 5.5V
■ Electrical Characteristics (Ta=25˚C±2˚C)
Parameter
Symbol
Condition
min.
typ.
max.
Unit
Total Circuit Current
Itot
VCC=5V
10.0
14.5
19.0
mA
VREF Output Voltage
VREF
VCC=5V
2.20
2.50
2.80
V
VFO–OF
VCC=5V
–300
0
300
mV
VFO–OFB
VCC=5V, VFB=VREF±1V
Applied
–200
200
mV
Focus Error Amp.
Output Offset Voltage
of Focus Error Amp.
Crosstalk Quantity
of Focus Error Offset Balance
I –V Conversion Gain
of Focus Error Amp.
I –V Conversion Relative Gain
of Focus Error Amp.
RFO
VCC=5V, VFB=VREF
65
93
121
kΩ
DRFO
VCC=5V, VFB=VREF
–12
0
12
%
Focus Balance Variable Range 1–H
BFO1–H
VCC=5V, VFB=VREF +1V
0.15
0.25
0.35
Focus Balance Variable Range 1–L
BFO1–L
VCC=5V, VFB=VREF –1V
1.19
1.70
2.21
Focus Balance Variable Range 2–H
BFO2–H
VCC=5V, VFB=VREF +1V
1.19
1.70
2.21
Focus Balance Variable Range 2–L
BFO2–L
VCC=5V, VFB=VREF –1V
0.15
0.25
0.35
VCC=5V, f=1kHz, 30kHz Input
–4.5
–3
–1.5
dB
VTR–OF
VCC=5V
–63
0
63
mV
VTR–OFB
VCC=5V, VTB=VREF ±1V
Applied
200
mV
Frequency Characteristics
of Focus Error Amp.
Tracking Error Amp.
Output Offset Voltage
of Tracking Error Amp.
Crosstalk Quantity
of Tracking Error Offset Balance
I –V Conversion Gain
of Tracking Error Amp.
I –V Conversion Relative Gain
of Tracking Error Amp.
GFO
–200
RTR
VCC=5V, VTB=VREF
420
600
780
kΩ
DRTR
VCC=5V, VTB=VREF
–15
0
15
%
Tracking Balance Variable Range 1–H
BTR1–H
VCC=5V, VTB=VREF +1V
0.185
0.285
0.385
Tracking Balance Variable Range 1–L
BTR1–L
VCC=5V, VTB=VREF –1V
1.20
1.75
2.30
Tracking Balance Variable Range 2–H
BTR2–H
VCC=5V, VTB=VREF +1V
1.20
1.75
2.30
Tracking Balance Variable Range 2–L
BTR2–L
VCC=5V, VTB=VREF –1V
0.175
0.275
0.375
–3.8
–2.3
– 0.8
Frequency Characteristics
of Tracking Error Amp.
CROSS Detection
GTR
CROSS Output H Level
VCR–H
CROSS Output L Level
VCR–L
RF-Amp.
RF-Amp. Offset Voltage
VRF–OF
VCC=5V
–75
RRF
VCC=5V
45.0
RF-Amp. I–V Conversion Relative Gain 1
DRRF
VCC=5V
–10
0
10
%
RF-Amp. Frequency Characteristics 1 Note)
GRF
VCC=5V, f=500kHz, 3MHz
–2.5
0
2.5
dB
RF-Amp. I–V Conversion Gain
VCC=5V, f=10kHz, 100kHz
VCC=5V, VTB=VREF
f=10kHz
VCC=5V, VTB=VREF
f=10kHz
Note) The value may fluctuate by the influence of printed board, socket and etc.
4.2
dB
V
0.8
V
0
75
mV
56.5
68.0
kΩ
ICs for CD/CD-ROM Player
AN8807SB
■ Electrical Characteristics (Cont.) (Ta=25˚C±2˚C)
Parameter
Symbol
Condition
min.
typ.
max.
Unit
AGC
AGC Max. Gain
GAGC
VCC=5V, f=500kHz, Sine Wave
10.0
14.5
19.0
dB
AGC Operation Gain
GOP–AGC
f=500kHz, VIN=500mVP–P
4
6
9
dB
AGC Compressibility
Gcm–AGC
3
6
9
dB
AGC Frequency Characteristics
Gf–AGC
f=500kHz, VIN=100mVP–P
f=3MHz, VIN=500mVP–P
–2
0
2
dB
0.1
0.135
VP–P
RFDET
RFDET Detection Operation
VNRF
f=500kHz
0.065
RFDET H Level
VNRF–H
f=500kHz
4.2
RFDET L Level
VNRF–L
f=500kHz
V
0.8
V
1.8
µA
BDO
BDO Detection Current
VCC=5V
1.0
BDO H Level
VBDO–H
VCC=5V, f=2kHz Rectangle Wave
4.2
BDO L Level
VBDO–L
VCC=5V, f=2kHz Rectangle Wave
IBDO
1.4
V
0.8
V
1.8
µA
OFTR
OFTR Detection Current
VCC=5V
1.0
OFTR H Level
VOFTR–H
VCC=5V, f=2kHz Rectangle Wave
4.2
OFTR L Level
VOFTR–L
VCC=5V, f=2kHz Rectangle Wave
LD ON H Input Level
VLDON–H
VCC=5V
3.5
V
LD OFF H Input Level
VLDOFF–H
VCC=5V
3.5
V
IOFTR
1.4
V
0.8
V
LD – APC
LD ON Operation Voltage (1)
VLD (1)
VCC=5V, V1 : DC Sweep
V. Det. Level (1)
VDet. (1)
VCC=5V, V23 : DC Sweep
52
V. Det. Level (2)
VDet. (2)
VCC=5V, V23 : DC Sweep
–98
V. Det. H Level
VDet.–H
4.2
V. Det. L Level
VDet.–L
VCC=5V, V23 : DC Sweep
VCC=5V, V23 : DC Sweep
0.135
0.170
0.205
V
75
98
mV
–75
–52
mV
0.8
V
V
µA
V. Detection
3TENV
CENV Detection Current
ICENV
VCC=5V
8.5
11
13.5
GCEA–ENV
VCC=5V
21
23
25
dB
CEA Input Impedance
RCEA
VCC=5V
6.5
8.25
9.5
kΩ
ENV Output Impedance
RENV
VCC=5V
6.5
8.25
9.5
kΩ
ENV-Amp. Offset Voltage
VOP–ENV
VCC=5V
–70
0
70
mV
CEA-Amp. Operation Voltage
VOP–CEA
VCC=5V
50
125
200
mV
CEA-ENV Transmission Characteristics
ICs for CD-ROM Player
AN8807SB
■ Operational Description (The values shown below are design values when supply voltageVCC=5V.)
• RF Amplifier
As shown in Figure 1, RF signals are generated by three-beam method pick-up. Equivalent resistance to RFOUT (Pin7) is
57.6kΩ, when resistance between RF– and RFOUT is 12kΩ.
Light level
48kΩ
36
12kΩ
RRF
–
Dark level
A
B
D
C
10kΩ
+
6
–
48kΩ
10kΩ
35
7
+
–
+
RRF (T)= 48kΩ ×
RRF
10kΩ
Figure 1 : RF Amplifier
• Focus Error Amplifier
As shown in Figure 2, the operation result of (A+C) – (B+D) is outputted to FEOUT (Pin27). Equivalent resistance to FEOUT
is 96kΩ, when resistance between FE and FEOUT is 20kΩ.
20kΩ
48kΩ
RFE
VCBA
36
A
B
D
C
A+ C
–
+
28
–
+
B+D
–
+
×2
fC =30kHz
29
–
20kΩ
48kΩ
35
27
–
VC
+
Figure 2 : Focus Error Amplifier
+
ICs for CD/CD-ROM Player
AN8807SB
The VCBA is for focus balance adjustment. Connecting 47kΩ of external resistance toPin299, signal ratio between A+C and
B+D can be controlled as shown in Table 1.
Table 1
VC
A+C
B+D
B+D
A+C
1.5V
0.14
7.0
2.5V
1.0
1.0
3.5V
7.0
0.14
• Tracking Error Amplifier
As shown in Figure 3, the tracking error amplifier receives the output currents E and F of three-beam method pin photo diode
for sub-beam detection, and outputs the operation result of E–F to TEOUT (Pin25).
32
VREF
470kΩ
E
fC6100kHz
–
33
VCBA
+
Subtraction
–
25
470kΩ
F
26
31
VREF
+
20kΩ
–
34
VCBA
+
30
–
+
Figure 3 : Tracking Error Amplifier
ICs for CD-ROM Player
AN8807SB
Pin31, and 32 are used to make the resistance converting the current to voltage variable. When these pins are directly connected
to VREF and 20kΩ of resistance is connected between TE and TE–, and between TE and TEOUT respectively, equivalent
resistance to TEOUT is 629kΩ.
Table 2
VC
E/F
F/E
1.5V
0.14
7.0
2.5V
1.0
1.0
3.5V
7.0
0.14
The VCBA is for tracking balance adjustment in the same way of for focus. Table 2 shows the tracking balance ratio under the
same conditions as shown in Table 1.
• AGC
In order to absorb the attenuation of RF signal by disk, pick-up dispersion, finger print and other factors, AGC circuit for RF is
incorporated.
The input impedance of Pin8 is approx. 27.9kΩ. By Pin10 (ARF), the gain-controlled RF-signal is outputted. Input allowable
level is approx. 1VP–P ~ 500mVP–P ~ 250mVP–P, and output is 1VP–P. Pin9 is a connecting pin with capacity for constructing the
AGC loop filter. It is recommended that the external capacitor of 1µF around should be connected to it for VCC.
RF
VCC
1µF
ARF
8
9
10
AGC
Figure 4 : AGC
• RFDET
The RFDET detects amplitude of RF signal inputted to Pin8. Threshold value is approx. 100mV (f=500kHz), and RF
Present=L, RF Absent=H are outputted.
ICs for CD/CD-ROM Player
AN8807SB
• BDO Detection
BDO is detected by the low speed detection circuit and high speed detection circuit. The high speed detection circuit is
incorporated. On the other hand, the capacitor of the low speed detection circuit must be connected to Pin13. The capacity value
is 2200pF and it is recommended that it should be connected for VCC. When the capacity value of Pin13 is increased, BDO is
detected with large RF missing rate. When it is decreased, BDO can be detected with small RF missing rate.
BDO present=H
BDO absent=L
• OFTR Detection
OFTR detection reversely corresponds with BDO detection. However, its detection method is the same as for BDO. Capacitor
for the low speed detection must be connected to Pin15. It is recommended that it should be connected to VCC at 2200pF in the
same way as for Pin13. The relation between the capacity value and OFTR detection timing is as the same for BDO.
OFTR=H
Off from OFTR=L
• APC
21
LD OFF
VCC
10µF
+
10Ω
–
2
LD
170mV
1
3
PD
LD ON/OFF
Figure 5 : APC
The reference voltage of LD is approx. 170mV fixed.
• Reference Supply
Servo reference supply is incorporated. Pin20 outputs VCC/2, and has approx. 3mA of current capacity for sink/source. It is
recommended that it should be given 1µF to 10µF of capacity in addition.
• Vibration Detection
The AN8807SB has a wind comparator of approx. ±75 mV. Abnormal vibration components of tracking error are detected and
the data for whether vibration is present or not is outputted to Pin22.
ICs for CD-ROM Player
AN8807SB
• Envelope Detection
The envelope detection circuit extracts fluctuation of RF signal required for adjustment of focus balance.
Pin11 and 12 are connecting pins with capacity for constructing the filter. It is recommended that for Pin11, a capacitor of
100pF around, and for Pin12, an external capacitor of 0.027µF around should be connected against VCC.
Pin19 is for output and must have external capacity for constructing the filter, and it is recommended that an external capacitor
of 0.027µF around should be connected to it for VREF.
CENV
CEA
11
AGC
ENV
12
19
ENV Detection
Figure 6 : Envelope Detection
• CROSS Detection
+
–
24
CROSS
4
25
C.CRS
TEOUT
Figure 7 : CROSS Detection
Track cross signals are detected from tracking error output. Pin4 is a connecting pin for constructing the filter, and it is
recommended that a capacitor of 2.2µF around should be connected to it for VREF.